Burglar-alarm.



F. L. HOLMES. BURGLAR ALARM.

APPLIUATION FILED AUG. 7, 1909.

Patented Nov. 15,1910.

$14M: M301 ZZZ aha;

THE'NORRIS pztras co., WASHINGTGN, n. c.

TET 1Q BlIRGLAR-ALARM.

Specification of Letters Patent.

Application filed August 7, 1909.

Patented Nov. 15, 1910.

Serial No. 511,754.

To all whom it may concern:

Be it known that I, FRANKLIN L. HOLMES, a citizen of the United States,residing at Smethport, in the county of McKean and State ofPennsylvania, have invented certain new and useful Improvements inBurglar- Alarms, of which the following is a specification.

This invention comprehends certain new and useful improvements indevices for sounding an alarm upon the unauthorized or surreptitiousopening of window sashes, cash drawers, and the like, and the inventionhas for its primary object, a simple, durable and efiicient constructionof burglar alarm of this type which will embody the characteristics ofneatness in appearance, cheapness in the cost of manufacture, simplicityand durability, and which will be positive and otherwise effective inoperation.

With this main and other objects in view as will more fully appear asthe description proceeds, the invention consists in certainconstructions, arrangements and combinations of the parts that I shallhereinafter fully describe and claim.

For a full understanding of the invention, reference is to be had to thefollowing description and accompanying drawings in which:

Figure l is a perspective view illustrating one application of myimproved burglar alarm; Fig. 2 is a side elevation thereof; and, Fig. 3is a vertical longitudinal sec tion.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of 'the accompanying drawingsby the same reference characters.

In the present embodiment of the invention, which is shown as applied tothe meet ing rails of window sashes, the invention consists essentiallyin a gong, strikers 'therefor, and actuating devices for the strikers,all of which are arranged to be carried by one of the sashes, theactuating device embodying a rotary element or wheel adapted to berotated by and upon the opening movement of the other sash.

In the drawing, the numeral 1 designates the gong which may be of anydesired size or design, the same being secured in any de sired way on abracket 2 formed on or secured to an upright post 3 designed to besupported on the upper edge of the meeting rail of a lower sash. In thepresent embodiment of the invention, the post 3 is secured to themeeting rail by a base plate a, the post havlng an annular enlargementor head 5 at its lower end around which engages a struck up flange 6formed on the base plate. The base plate is secured by screws or otherfastening devices to the meeting rail as clearly illustrated in thedrawing.

A clapper actuating or carrying arm 7 is detaohably mounted upon theupper arm of the post 3. This arm which is in the na ture of a trip, isprovided at one end with depending and diverging fingers 8 formed attheir extremities with the clapper heads and mounted within the gong 1on opposite sides of the bracket 2 so that as the trip arm 7 isactuated, the,clappers will strike the gong. The oppositely extendingend of the trip arm 7 is formed with a slit 9 adapted to receive theupper end of a vertically disposed spring which is secured at its lowerend to the base plate 4. In the present instance, the means attachingthe spring 10 in place consists of oppositely extending lugs 11 formedon the lower extremities of the spring and extending underneath the baseplate a after the spring has been passed upwardly through a slot 12 inthe base plate so as to secure the laterally turned lower extremity ofthe spring between the base plate and the meeting rail. A casing 13 ismounted contiguous to the spring 10, said casing in the presentembodiment of the invention being formed with bottom openings throughwhich a slightly raised portion 14 of the base plate extends so as tosecure the casing in place. If desired, in addition to this means ofattaching the casing, the latter may be provided with outstanding ears15 secured to the meeting rails by screws or other fastening devices. Arotary element or wheel 16 is mounted within the casing 13, on ahorizontally extending spindle or shaft 17 journaled in horizontallydisposed slots 18 formed in the sides of the casing and a spring 19 isformed with two oppositely extending arms bearing with tension on twoends of the shaft 17 on opposite sides of the wheel 16, the said springbeing secured to the bottom of the casing in place at its lower end inany desired way. The wheel 16 projects out through a vertical slot 16formed in one wall of the casing and may be provided with teeth 20designed to mesh with a vertically disposed rack 21 secured to theadjacent rail of the upper sash. The

trip arm projects into the casing in between the spokes of the wheel 16as clearly illustrated in the drawing. Obviously the periphery of thewheel 20 may directly engage the rail of the upper sash so as to operateby frictional engagement only, in which event the wheel may be providedwith a rubber or similar rim to secure the proper frictional contact.

From the foregoing description in connection with the accompanyingdrawing, it is believed that the operation of my improved burglar alarmis obvious. In th e practical operation or use of the device, the baseplate 4 is secured to the meeting rail of the lower sash, so as tosecure the post 3, spring 10 and casing 13 in proper position, one endof the trip arm 7 extending in between the spokes of the wheel 16 asabove stated. The parts 21 are so arranged that the periphery of thewheel 16 will directly engage the adjacent rail of the upper sash or therack 21 secured thereto, and obviously then when either of the sashes ismoved in an unauthorized attempt to open the window, the wheel 16 willturn and the spokes thereof will successively strike the trip arm 7which carries the clappers so that the latter will strike the gong andsound the alarm.

It will be seen that the device is composed of comparatively few .partsthat may be easily and cheaply manufactured and readily assembled. Inorder to render the device inoperative, it is only necessary to detachthe trip arm 7 whereupon either of the sashes may be moved withoutsounding any alarm upon the gong.

While I have shown my device as applied to a window sash, it is obviousthat it is equally applicable for use with cash or other locked drawersor the like, that it may be secured to any side of the window or othermovable part by merely reversing the position of the base plate andconcomitant parts.

It is to be understood that the invention is not limited to the exactconstruction, arrangement and proportion of the parts herein shown anddescribed, as various changes may be made in the details of constructionand relative arrangement of the parts without departing from the scopeof the invention as defined by the appended claims.

Having thus described the invention, what is claimed as new is: I

1. A burglar alarm, embodying a casing formed with slots, a gong, asupport for the casing and gong, a shaft mounted in said slots, a tripwheel mounted on said shaft, a trip arm arranged to strike the gong andadapted to be actuated by engagement with the trip wheel, and a springsecured in the casing and formed with two arms bearing on the shaft onopposite sides of said wheel with a tendency to move the shaft towardone end of the slots, and means for turning said wheel upon the movementof said support.

2. A burglar alarm, comprising a post provided with a laterallyextending bracket, a gong secured to the bracket, a trip arm mountedupon the upper end of said post, a vertically disposed spring secured tosaid trip arm, means for holding said spring in place, a casing, meansfor fastening said casing in place, and a wheel mounted to turn in saidcasing and protruding therefrom, said wheel embodying spokes adapted toengage the trip arm and actuate the same.

3. A burglar alarm, comprising a base plate, a post provided with ahead, and the base plate being formed with a vflange engaging said head,the post being provided with a bracket, a gong secured to said bracket,a trip arm mounted on one end of said post, the base plate being formedwith a slit, a spring formed at one end with a lug taking through andunderneath said slit, said spring engaging at its other end the saidtrip arm, a casing, the base plate being formed with a raised portionextending over the bottom of the casing to secure the same in place, anda rotary element mounted in said casing and connected to the trip arm.

In testimony whereof I afiix my signature presence of two witnesses.

FRANKLIN L. HOLMES. [L.S.] Witnesses:

J. S. MCCARTHY, WILLIAM F. SPECI-IT.

